var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var ObjectId = require('mongoose').Schema.Types.ObjectId;
// var ObjectId = require('mongoose').Types.ObjectId;
// Define User schema 
var _recommend = new Schema({ 
    content : String,
    username : String, 
    create_time: { type: Date, default: Date.now },
    update_time: { type: Date, default: Date.now }
});

// export them 
exports.recommend = mongoose.model('recommend', _recommend);